Observation of long-range, near-side angular correlations in proton-proton collisions at the LHC
Author(s)Alver, Burak Han; Bauer, Gerry P.; Bendavid, Joshua L.; Busza, Wit; Butz, Erik M.; Cali, Ivan Amos; Chan, M.; Dutta, Valentina; Everaerts, Pieter Bruno Bart; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Hahn, Kristian Allan; Harris, P.; Kim, Y.; Klute, Markus; Lee, Y. J.; Li, W.; Loizides, Constantin; Luckey, P. David, Jr.; Ma, Teng; Nahn, Steven; Paus, Christoph M. E.; Roland, Christof E.; Roland, Gunther M.; Rudolph, M.; Stephans, George S. F.; Sumorok, Konstanty C.; Sung, Kevin Kai Hong; Wenger, Edward Allen; Wyslouch, B.; Xie, S.; Yang, M.; Yilmaz, Yetkin; Yoon, A. S.; Zanetti, Marco; ... Show more Show less
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Results on two-particle angular correlations for charged particles emitted in proton-proton collisions at center-of-mass energies of 0.9, 2.36, and 7 TeV are presented, using data collected with the CMS detector over a broad range of pseudorapidity (η) and azimuthal angle (ϕ). Short-range correlations in Δη, which are studied in minimum bias events, are characterized using a simple “independent cluster” parametrization in order to quantify their strength (cluster size) and their extent in η (cluster decay width). Long-range azimuthal correlations are studied differentially as a function of charged particle multiplicity and particle transverse momentum using a 980 nb[superscript −1] data set at 7 TeV. In high multiplicity events, a pronounced structure emerges in the two-dimensional correlation function for particle pairs with intermediate p [subscript T] of 1–3 GeV/c, 2.0 < |Δη| < 4.8 and Δϕ ≈ 0. This is the first observation of such a long-range, near-side feature in two-particle correlation functions in pp or p[−over]p collisions.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal of High Energy Physics
The CMS collaboration et al. “Observation of Long-range, Near-side Angular Correlations in Proton-proton Collisions at the LHC.” Journal of High Energy Physics 2010.9 (2010).
Final published version